<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片式图 -->
    <el-card>
      <!-- 警告提示 -->
      <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon></el-alert>
      <!-- 选择商品分类 -->
      <el-row class="cat-opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 级联选择框 -->
            <el-cascader v-model="selectedCateKeys" :options="cateList" :props="cateProps" @change="handleChange">
            </el-cascader>
        </el-col>
      </el-row>
      <!-- tab标签页 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 暂开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag type="success" v-for="(item,index) in scope.row.attr_vals" :key="index" closable @close="handleClose(index,scope.row)">
                  {{ item }}
                </el-tag>
                <!-- 输入框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput"
                size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加tag按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column prop="attr_name" label="参数名称"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                <el-button size="mini" type="danger" icon="el-icon-search" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
          <!-- 静态参数表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 暂开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag type="success" v-for="(item,index) in scope.row.attr_vals" :key="index" closable @close="handleClose(index,scope.row)">
                  {{ item }}
                </el-tag>
                <!-- 输入框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput"
                size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加tag按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column prop="attr_name" label="属性名称"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                <el-button size="mini" type="danger" icon="el-icon-search" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog :title="'添加'+ titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogclosed">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数的对话框 -->
    <el-dialog :title="'修改'+ titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogclosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
   </el-dialog>
  </div>
</template>
<script type="text/ecmascript-6">
export default {
  name:'Params', 
  data() {
    return {
      //商品分类列表
      cateList:[],
      //级联选择框配置对象
      cateProps:{
        expandTrigger: 'hover',
        value:"cat_id",
        label:"cat_name",
        children:"children"
      },
      //级联选择框双向绑定的数组
      selectedCateKeys:[],
      //被激活默认标签页
      activeName:"many",
      //动态参数数据
      manyTableData:[],
      //静态参数数据
      onlyTableData:[],
      //添加对话框显示
      addDialogVisible:false,
      //添加参数的表单对象
      addForm:{
        attr_name:""
      },
      //添加表单的验证规则对象
      addFormRules:{
        attr_name:[
          {required:true,message:"请输入参数名称",trigger:'blur'}
        ]
      },
      //修改对话框的显示
      editDialogVisible:false,
      //修改的表单对象
      editForm:{},
      editFormRules:{
        attr_name:[
          {required:true,message:"请输入参数名称",trigger:'blur'}
        ]
      }
    }
},
  components:{},
  computed:{
    //按钮是否被禁用则返回true
    isBtnDisabled(){
      if(this.selectedCateKeys.length!==3){
        return true
      }
      return false
    },
    //当前选中的三级分类id
    cateId(){
      if(this.selectedCateKeys.length===3){
        return this.selectedCateKeys[2]
      }
      return null
    },
    //动态计算标题文本
    titleText(){
      if(this.activeName==="many"){
        return "动态参数"
      }
      return "静态属性"
    }
  },
  created(){
    this.getCateList()
  },
  methods:{
    //获取商品分类列表
    async getCateList(){
      const {data:res} = await this.$http.get("categories")
      if(res.meta.status!==200){
        return this.$message.error("获取商品分类失败！")
      }
      this.cateList = res.data
    },
    //级联选择框改变触发
    handleChange(){
      this.getParamsData()
    },
    //tab页签点击事件的处理函数
    handleTabClick(){
      this.getParamsData()
    },
    //获取请求参数列表数据
    async getParamsData(){
      //选中的不是三级分类
      if(this.selectedCateKeys.length !== 3){
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return 
      }
      //选中三级分类,根据当前所选的分类id，获取参数
      const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
        params:{
          sel:this.activeName
        }
      })
      if(res.meta.status!==200){
       return this.$message.error("获取参数列表失败！")
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' '):[]
        //控制输入框显示与隐藏,输入框内容
        item.inputVisible = false
        item.inputValue = ""
      });
      if(this.activeName === "many"){
        this.manyTableData = res.data
      }else{
        this.onlyTableData = res.data
      }
      console.log(res.data)
    },
    //关闭对话框
    addDialogclosed(){
      this.$refs.addFormRef.resetFields()
    },
    //添加分类，确定按钮
    addParams(){
      this.$refs.addFormRef.validate(async (valid)=>{
        if(!valid) return
        const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
          attr_name:this.addForm.attr_name,
          attr_sel:this.activeName
        })
        if(res.meta.status !== 201){
          return this.$message.error("添加参数失败！")
        }
        this.$message.success("添加参数成功！")
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    //点击修改按钮
    async showEditDialog(attr_id){
      //attr_id当前参数的id
      const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
        params:{
          attr_sel:this.activeName
        }
      })
      if(res.meta.status !== 200){
        return this.$message.error("获取参数信息失败！")
      }
      this.editForm = res.data 
      this.editDialogVisible = true
    },
    editDialogclosed(){
      this.$refs.editFormRef.resetFields()
    },
    //修改对话框确认按钮
    editParams(){
      this.$refs.editFormRef.validate(async (valid)=>{
        if(!valid) return
        const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
          attr_name:this.editForm.attr_name,
          attr_sel:this.activeName
        })
        if(res.meta.status !== 200){
        return this.$message.error("修改参数失败！")
        }
        this.$message.success("修改参数成功！")
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    //根据id删除参数
    removeParams(attr_id){
      this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(async () => {
          const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
          if (res.meta.status !== 200) {
            return this.$message.error('删除参数失败！')
          }
          this.$message({
            type: 'success',
            message: '删除成功!'
          })
          this.getParamsData()
        }).catch(() => {
          this.$message({
            type: 'info',
            message: '已取消删除'
          })          
        })
    },
    //文本框失去焦点，或者按下enter都会触发
    handleInputConfirm(row){
      if(row.inputValue.trim().length === 0){
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      //如果用户输入了内容，需要做后续操作 split分割join连接
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    //点击按钮，显示输入框
    showInput(row){
      row.inputVisible = true
      //获取输入框焦点
      //$nextTick,当页面上的元素被重新渲染之后，才会执行回调函数的代码，如果只写执行，输入框还没渲染出来，$refs拿不到dom节点
      this.$nextTick(()=> {
      this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    //提交动态参数参数项给服务器
    saveAttrVals(row){
      this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
        attr_name:row.attr_name,
        attr_sel:row.attr_sel,
        attr_vals:row.attr_vals.join(' ')
      }).then(({data:res})=>{
        if(res.meta.status !== 200){
          return this.$message.error("修改参数项失败！")
        }
        this.$message.success("修改参数项成功！")
      })
    },
    //删除动态参数属性
    handleClose(index,row){
      //splice 索引 几个 会修改原数组
      row.attr_vals.splice(index,1)
      this.saveAttrVals(row)
    }
  } 
}
</script>
<style lang="scss" scoped>
.cat-opt{
  margin: 15px 0;
}
.el-tag{
  margin: 10px;
}
.input-new-tag{
  width: 120px;
}
</style>